Not necessarily true. The incidence rates of those are well-known. Rarer side effects are impossible to find by comparing vaccinated/unvaccinated in a phase 3 a

Not necessarily true. The incidence rates of those are well-known. Rarer side effects are impossible to find by comparing vaccinated/unvaccinated in a phase 3 and need larger groups to be found. That’s routine, though. Look at the VITT for the Adenoviral vector vaccines, no strict control group was necessary to identify that.